Top definition
When you can't be arsed to check if it is A.M or P.M but want to greet someone with something more interesting than "hello".
"Hello Ryan, how are you?"
"Mornfternoon Matthew, i'm fine thanks. you?"
"Dafuq does mornfternoon mean?"
by MrDarksideJim April 29, 2013
Get the mug
Get a Mornfternoon mug for your sister Helena.